{
  "manageEntity": {
    "action": "Save",
    "entityId": "254263",
    "entityType": "Track",
    "nonce": "0xec8e0dce273278cae5c72899a07c3702a1ae14775a60223b28d9573aa2f33114",
    "signature": "0xd661674bd32815ff0d163c5907b7919309c2d0dc71fc6b21f12aaa05a80866f26a736d3b0cca92e7c0e5ce4d650a3102e0fcabec2acdc5e3b2e2bb2b0385bf461b",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}